Abstract
The release of fission products to the environment is one of the concerns with nuclear power. During an accident, the most likely released are the volatile fission products i.e., tellurium. To evaluate the behavior of tellurium in the event of an accident, it was heated under different conditions (oxidizing, inert, reducing; both dry and humidified). The formed vapor was transported to surfaces (aluminum, copper, zinc) at room temperature that can be found in the BWR-containment.All formed deposits were examined for morphology and species. Moreover, the content of sodium hydroxide liquid traps following the metal surfaces and filter was also investigated. In these traps, the highest amount of tellurium was found under humid-reducing followed by humid-oxidizing conditions. In the deposit removed from the zinc surface acquired under the latter conditions, elemental analysis observed zinc, indicating a possible reaction between tellurium and zinc. The corresponding trap showed significant amounts of zinc.
Highlights
In the event of a nuclear accident, the release of fission products (FP:s) is considered one of the main issues
The aim of this paper is to address the previously mentioned lack of knowledge through experiments designed to simulate the behavior of tellurium as it enters the containment from the reactor coolant system and to determine how the deposition occurs on surfaces found therein and concurrently acquire knowledge of tellurium transport
Methods included standard laboratory balance, inductively coupled plasma mass spectrometry (ICP-MS, content of the sodium hydroxide liquid traps), scanning electron microscopy (SEM, morphology of the particles found in the deposit on the metal surfaces) coupled with energy dispersive X-ray spectroscopy (EDX, elemental composition of the particles found in the deposit on the metal surfaces), and glancing angle X-ray diffraction spectroscopy (XRD, speciation of the deposits on the filters and the metal surfaces)
Summary
In the event of a nuclear accident, the release of fission products (FP:s) is considered one of the main issues. The FP iodine has been the main focus of the research community. This is due to the very high volatility of several iodine species (Ducros, 2012), complexation with organics (Bosland et al, 2014), and accumulation in the human thyroids (Yoshida et al, 2014). The latter makes it possible for a substantial dose to the population.
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